Thanks for all good input! I will do one last try to change to OEM Denso O2 sensor and see if it works. Apparently, these cars are very picky about O2 sensors and first two I fitted were 1. wrong part # 2. Right part # but some Chinese junk brand.
What makes me think it is O2 is that it is stuck at 1.25V while downstream O2 is cycling as it should. Also, O2 output is typically between 0.1V and 0.9V.
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bad diaphragm in the fuel pressure regulator
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These cars are unbelievably cheaply built. There is no FPR on the engine, FPR is plastic part mounted on a tank and there is no vacuum line at all...it is returnless system with constant fuel pressure regardless of intake vacuum. I suppose they let ECU map handle different pressure delta over the injector instead.
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Is there a schrader test port on the rail? Check if your fuel pressure is holding.
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There was a until 2002, then Chrysler removed it to save money. So you need a T-port adapter in order to measure pressure.
P.S.
I really like the utility but am confused on just how cheaply built this thing is. Leaf springs in the rear, no cabin air filter at all, no fuel filter, undersized brakes from Chrysler K-car, plastic (!) brake pistons, no AMM (just MAP sensor), no fuel filter, no vacuum compensation for fuel pressure. They really went all the way with "decontenting"...